Apparently mom and dad knew what they were talking about.

Once there was a little boy who was curious about what a strip club was like so one day he decided to sneak into one. Once he was in, he watched as the strippers danced. He watched until they started taking off their clothing. That's when he bolted out the door and started running down the street and ran into a man. The man asked the boy, "What's wrong young man? You look like you just saw a ghost!". The little boy replies, "My mommy and daddy told me that if I ever watched anybody undress, I'd turn to stone...and all of a sudden I felt something hard!".